/tmp/.s.PGSQL.5432.lock: Permission denied

Hi,

I tried to run postgreSQL service under NT4 many times, and I always get
the following messages in postgreSQL.log:

FATAL 1: Can't read lock file /tmp/.s.PGSQL.5432.lock: Permission denied\

(full detail is in the attachment). What am I going to do to solve the problem?
thanks.